<template>
  <el-container class="home-container">
    <!-- 头部 -->
    <el-header>
      <div>
        <img src="../assets/header.jpg" alt />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">注销</el-button>
    </el-header>
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'" class="right">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏侧边区 -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409eff"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          router
          :default-active="activePath"
        >
        <!-- 一级菜单 -->
          <el-submenu :index="item.id+ ''" v-for="item of menuList" :key="item.id">
            <!-- 一级菜单的模板区 -->
            <template slot="title">
              <!-- 图标 文本-->
              <i :class="iconsObj[item.id]"></i>
              <span>{{item.authName}}</span>
            </template>
              <!-- 二级菜单 -->
              <el-menu-item
                :index="'/'+subItem.path"
                v-for="subItem in item.children"
                :key="subItem.id"
                @click="saveNavState('/'+subItem.path)"
              >
                <template slot="title">
                  <!-- 图标 文本-->
                  <i class="el-icon-menu"></i>
                  <span>{{subItem.authName}}</span>
                </template>
              </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 右侧main 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>
<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menuList: [],
      // 为遍历得到的数据添加不同的图标(key 是id值, value是字体图标名称)
      iconsObj: {
        '125': 'iconfont icon-user',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 激活状态
      activePath: ''
    }
  },
  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有菜单的数据
    async getMenuList () {
      const { data: res } = await this.$axios.get('menus')
      // console.log(res) 获取到数据
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
    },
    // 点击切换菜单的折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  },
  created () {
    this.getMenuList()
    // 赋值激活状态
    this.activePath = window.sessionStorage.getItem('activePath')
  }
}
</script>
<style lang='less' scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    img {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      margin-right: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu {
    border-right: none
  }
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
  margin-right: 10px
}
.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
/*实现只有main有滚轮*/
</style>
